Buckingham st



(No Model.)

BQST. -J. HOYT. PERPETUAL MONTHLY CALENDAR.

No. 471,120. Patented Mar. 22,%89Z.

THE Nunms FH'ERQ co., murmumm. wAsmNn'ron, n, c.

llmrnn ST TES PATENT QFFICE.

BUCKINGHAM ST. JOHN HOYT, OF NElV YORK, N. Y.

PERPETUAL MONTHLY CAL E N DAR.

SPECIFICATION forming part of Letters Patent No. 471,120, dated March22, 1892.

Application flledMity 29,1891. Serial No. 394,458. (No model.)

To all whom it may concern.-

Be it known that I, BUGKINGHAM ST. JOHN HOYT, of the city and county ofNew York, in the State of New York, have invented a new and usefulImprovement in Perpetual Monthly Calendars, of which the following is aspecification.

My invention relates to an improvement in perpetual monthly calendars inwhich provision is made for constructing the parts in a durable andornamental manner, so that the calendar may be utilized for a long termof years without any exchange of parts and may be used until worn out bysimply an exchange of the year-wheel every twenty years, more or less.

A practical embodiment of my invention is represented in theaccompanying drawings, in which Figure 1 is a View of the calendar infront elevation. Fig. 2 is a vertical transverse section through line 00ac of Fig. 1. Fig. 3 is a view in front elevation, partly in section, aportion of the case being broken away to show the operative partstherein. Fig. 4 is a View in rear' elevation, and Fig. 5 is aview intransverse section through line y y of Fig. 1.

The front of the casing is represented by A and the rear by B. In theform in which I have here shown it the casing is rectangular in shape,the front and back of the casing being separated from each other a shortdistance, in order to admit of the insertion between them of the movableparts. The front and back are united at their edges and are intended tobe formed of some suitable sheet or plate metal-such, for example, assilver, either solid or plated; but they may be formed of celluloid,paper, or any other suitable material.

The central portion of the front A of the casing is subdivided into fourcolumns of seven sections each and numbered from 1 to 28, inclusive,beginning with the top of the left-hand column and ending with thebottom of the right-hand column. This is for the purpose of representingthe least number of days contained in any one month,and-when readhorizontally will denote the days during the month corresponding to eachof the seven days of the week. These several columns are denoted by do,&c. To the right of the column a there is an opening 0, formed in thefront of the casing and extending down a distance of three numbers.Located in sliding adjustment in back of the front plate A is a strip asubdivided upon its face, as shown in Fig. 3, to correspond with thesubdivisions of the columns to the left and bearing upon its face thenumbers 29, 30, 31, 29, 30, blank, 29, blank, blank from the topdownwardly in the order named. If the strip a be slid so as to bring theupper number 29 at the top of the column, there will then be exposedthrough the opening 0 the numbers 29, 30, 31,following in order afterthe number 28 at the bottom of the column a and indicating on the faceof the calendar thirty-one days, the number of days contained in certainof the months. By sliding the strip a upwardly until the number 29,which follows the number 31, reaches a position at the top of thecolumn, there will then be exposed through the opening 0 the numbers29,30, blank, to indicate the number of days contained in certain otherof the months. Again, if the said strip a be slid upwardly until thenumber 29, next below blank, is in position at the top of the opening ofthe column,there will then be exposed through the openingO the number29,blank, blank, to indicate the number of days in the month of Februarywhen the same occurs in aleap-year. To the left of the column a, thereis an opening C,-extending the length of the columns and of sufficientwidth to expose the names of the days of the week. 7 A sliding strip 0is located behind the plate B, so as to cover the opening 0, and thesaid sliding strip has printed upon its face, beginning from the top,extending in order downwardly, Monday, Tuesday, Wednesday, Thursday,Friday, Saturday, Sunday, Monday, Tuesday, Wednesday, Thursday, Friday,Saturday, the said names being spaced apart to correspond with thedistances between the successive numbers 1, 2, 3, 4, &c., denoting thedays of the month. The sliding movement of the strips 0 is such that anyday of the week may be placed opposite any one of the seven numbers inthe column a to denote the day on which the first of each month occurs.

A rotary disk D is pivotally secured between the front and back plates,and is provided along its face near its periphery with the names of thetwelve months, an opening 0' in the front plate above the columns Ct, a,&c., being provided, so that the name of any one of the months may beexposed through the opening by rotating the said disk D.

To indicate the year, there is an opening 0 provided below the columns aa, &c., through the front plate A, and there is located between thefront and back plates a rotary disk (I, carrying upon its face near itsmargin the numbers denoting the years from 1891 up to 1910, thearrangement being such that by rotating the disk dany oneof the numbersmay be exposed through the opening 0 in the front plate. The guides inwhich the strips a and c slide may be formed by swaging or bending inthe metal of the front plate, as shown at a (see Fig. 5,) and thenturning the inner edges of the inwardly-set metal toward each other.This forms a bearing to prevent the lateral and rearward displacement ofthe strips throughout the length of the openings through the plate,while the extension of the strips above and below the openings behindthe front plate A holds them against forward displacement.

I have shown in the present instance as a convenient means for operatingthe strips pins or studs E,projecting from the strips to which they aresecured through slots 1), formed in the back plate B. I have alsoprovided a finger-piece d in connection with the spindle of the disk Dfor rotating it from the back of the back plate 13. This, however, isnot essential, as both the disk D and the disk cl may be convenientlyrotated by insertingthe finger or a pointed instrument through thecurved slots (1 (Z formed in the back plate, into contact with thedisks. It is also obvious that the strips 0 and a" might be manipulatedby pressure through the openings 0 C; but such manipulation would have atendency to deface them if often repeated, and for this reason it isdesirable that the operating studs or pins E be employed. I

The calendar, as shown in Fig. 1, is set for the month of May, 1891. Toset it for the month of June, 1891, the disks D would be turned to bringthe name June before the opening 0', the strip 0 would be sliddownwardly until the word Monday fell in the horizontal line oppositethe figures l, S, &c., and the strip a would be elevated until thenumbers 29, 30, and blank appeared in front of the opening C. From theabove it will appear that the calendar as thus construeted may be made,if so desired, of precious metals, and be utilized as an ornament,

as well as a means of information, through the long series of years.

\Nhat I claim is- 1. The herein-described perpetual monthly calendar,comprising a front plate presenting a series of numbers common to allthe months,

the said plate being provided with openings through the front plate atthe right and left of said series, movable strips located in-position toexpose through said openings the days of the week and the numbers of theadditional days of the month, and means for indicating the month,substantially as set forth.

2. The herein-described perpetual monthly calendar, comprising a frontplate provided with series of numbers denoting the number of days commonto all the months, the said plate being further provided with openingsat the right and left of said series, movable strips located in positionto expose the days of the week and the numbers denoting the additionaldays of the month through said openings, a movable piece bearing thenames of the months, and means for presenting them at pleasure inposition to be seen through an opening in the front plate, substantiallyas set forth.

3. The herein-described perpetual monthly calendar, comprising the frontplate having series of numbers thereon denoting the numo ber of dayscommon to all the months and having openings therethrough for exposingthe numbers of the additional days, the names of the days of the week,the month, and the year, movable strips located behind the front 5 plateand bearing thereon, numbers denoting the additional days of the monthand the days of the week, a rotary disk provided with names of themonths, and a rotary disk provided with the numbers denoting the years,

substantially as set forth.

4. The combination, with the plate provided with openings and havinginwardly-turned guides along the edges of the openings, of the movablestrips held against lateral and rear-

